JPS62154230A - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
JPS62154230A
JPS62154230A JP60293695A JP29369585A JPS62154230A JP S62154230 A JPS62154230 A JP S62154230A JP 60293695 A JP60293695 A JP 60293695A JP 29369585 A JP29369585 A JP 29369585A JP S62154230 A JPS62154230 A JP S62154230A
Authority
JP
Japan
Prior art keywords
powder
magnetic
inorg
magnetic layer
wear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP60293695A
Other languages
Japanese (ja)
Inventor
Sadamu Kuze
定 久世
Masayoshi Kawarai
正義 河原井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Ltd
Original Assignee
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Priority to JP60293695A priority Critical patent/JPS62154230A/en
Publication of JPS62154230A publication Critical patent/JPS62154230A/en
Pending legal-status Critical Current

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  • Magnetic Record Carriers (AREA)
  • Paints Or Removers (AREA)

Abstract

PURPOSE:To improve the wear resistance of a magnetic layer while suppressing the wear of a magnetic head by incorporating inorg. carbide powder and inorg. oxide powder of the same element common with the inorg. carbide in combination into the magnetic layer. CONSTITUTION:The inorg. carbide powder having >=1,500kg/mm<2> Vickers hardness and the inorg. oxide powder of the same element common with the inorg. carbide are incorporated into the magnetic layer. The same element common with the inorg. carbide powder and the inorg. oxide powder is specified to any element selected from Si, Ti, Zr, W, Ta, V, Nb, Hf, and B. The intended effect is not obtainable with the inorg. carbide powder of any selected element if the average particle size thereof is 0.1mum or smaller. There is the possibility of wear of a magnetic head if the powder having >=0.7mum size is used. The intended effect is not obtainable with the inorg. oxide powder if the average particle size thereof is <=0.02mum. The surface roughness of the magnetic layer is poor and the electromagnetic conversion characteristic is low if the powder having >=1.0mum size is used.

Description

【発明の詳細な説明】 〔産業上の利用分野] この発明は磁気記録媒体に関し、さらに詳しくは耐久性
に優れた磁気記録媒体に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium, and more particularly to a magnetic recording medium with excellent durability.

〔従来の技術〕[Conventional technology]

一般に、ポリエステルフィルムなどの基体上に磁性粉末
、結合剤樹脂、有機ン容剤およびその他の必要成分から
なる磁性塗料を塗着してつくられる磁気記録媒体は、記
録再生時に磁気ヘッドなどと激しく摺接するため磁性層
が摩耗され易く、磁性層の摩耗が少なくて耐久性に優れ
たものが要求される。
In general, magnetic recording media, which are made by coating a magnetic paint consisting of magnetic powder, binder resin, organic solvent, and other necessary components on a substrate such as a polyester film, are subject to intense rubbing against magnetic heads during recording and playback. Since the magnetic layer is in contact with the magnetic layer, it is easily abraded, and a magnetic layer that is less abraded and has excellent durability is required.

特に、近年、磁気記録媒体における高密度記録化の要求
がますます高くなり、非常に微細な磁性粉末を使用した
り、使用する磁性粉末を酸化鉄磁性粉末から金属鉄磁性
粉末、合金磁性粉末などへ変更したりして、この要求に
答えているが、微細な磁性粉末を使用するほど記録密度
が向上される反面磁性層の機械的強度が弱くなり、また
金属鉄磁性粉末、合金磁性粉末などは、酸化鉄磁性粉末
に比べて比較的柔らかいため、同様に記録密度が向上さ
れる反面磁性層の機械的強度が弱くなり、磁性層が摩耗
されやすい。
In particular, in recent years, the demand for high-density recording in magnetic recording media has become higher and higher. However, while the recording density improves as finer magnetic powder is used, the mechanical strength of the magnetic layer becomes weaker, and metallic iron magnetic powder, alloy magnetic powder, etc. Since iron oxide magnetic powder is relatively soft compared to iron oxide magnetic powder, the recording density is similarly improved, but the mechanical strength of the magnetic layer is weakened, and the magnetic layer is easily worn out.

このため、磁性層の耐摩耗性を改占する方策として、磁
性層中に、たとえば、Cr2O3扮未、ノ\1203扮
末などのモース硬度が6以上の無機わ)末を磁性層中に
混入することが行われているが、このようなモース硬度
が6以上の無機粉末を使用する場合は、磁気記録媒体の
耐摩耗性はかなり改善されるものの、磁性層と摺接する
磁気ヘッドの摩耗が大きく、磁気ヘッドの寿命を低下さ
せるという難点がある。
Therefore, as a measure to improve the wear resistance of the magnetic layer, for example, an inorganic powder with a Mohs hardness of 6 or more, such as Cr2O3 powder or No\1203 powder, is mixed into the magnetic layer. However, when such inorganic powders with a Mohs hardness of 6 or more are used, the wear resistance of the magnetic recording medium is considerably improved, but the wear of the magnetic head that makes sliding contact with the magnetic layer is increased. This has the disadvantage that it shortens the life of the magnetic head.

そこで、このような欠点を改善するため、これらのモー
ス硬度が6以上の無機粉末に、さらにこれらよりやや硬
度が小さいT i O2粉末、SiO2扮未、ZrO2
粉末、cx−Fe203粉末などの磁気ヘッドの摩耗を
抑制できる味機粉末を添加し、これらを併用して、磁気
ヘッドの摩耗を抑制しようという試みが行われている。
Therefore, in order to improve such drawbacks, in addition to these inorganic powders with a Mohs hardness of 6 or more, TiO2 powder, SiO2 powder, and ZrO2 powder, which have a slightly smaller hardness than these, are used.
Attempts have been made to suppress the wear of the magnetic head by adding flavoring powders capable of suppressing the wear of the magnetic head, such as powder and CX-Fe203 powder, and using these together.

(特開昭56−13525号、特開昭57−12421
号、特開昭57−24026号、特開昭57−5553
3号、特開昭57−183628号) 〔発明が解決しようとする問題点〕 ところが、これらのモース硬度が6以上の無機粉末と、
磁気ヘッドの摩耗を抑制できる無機粉末とを、組合せて
併用するだけでは、磁性層の耐摩耗性を充分に向上させ
、かつ磁気ヘッドの摩耗を充分に抑制することができず
、未だ、磁気へノドの摩耗を充分に抑制しながら耐摩耗
性を充分に向上させたものは得られていない。
(JP-A-56-13525, JP-A-57-12421
No., JP-A-57-24026, JP-A-57-5553
(No. 3, JP-A-57-183628) [Problems to be solved by the invention] However, these inorganic powders with a Mohs hardness of 6 or more,
Simply using inorganic powders that can suppress the wear of magnetic heads in combination cannot sufficiently improve the wear resistance of the magnetic layer and sufficiently suppress the wear of the magnetic heads. No material has been obtained that sufficiently improves wear resistance while sufficiently suppressing the wear of the throat.

〔問題点を解決するための手段〕[Means for solving problems]

この発明は、かかる事情に鑑み種々検討を行なった結果
なされたもので、ビッカース硬度が1500kg/m耐
以上の無機炭化物粉末と、該無機炭化物と共通する同一
元素の無R酸化物粉末とを併用して磁性層中に含有させ
ることによって、磁気ヘットの摩耗を充分に抑制しなが
ら、磁性層の耐摩耗性を充分に向上させたものである。
This invention was made as a result of various studies in view of the above circumstances, and uses an inorganic carbide powder with a Vickers hardness of 1500 kg/m or more and an R-free oxide powder of the same element as the inorganic carbide. By incorporating it into the magnetic layer, the wear resistance of the magnetic layer is sufficiently improved while the wear of the magnetic head is sufficiently suppressed.

この発明において使用される炭化物粉末は、ビアカース
硬度が1500kg/mm以上の無機炭化物粉末である
ことが好ましく、ビッカース硬度が1500kg/mr
+f以上であると、比較的硬いためこの無機炭化物粉末
によって、磁性層の耐摩耗性が充分に向上される。また
この無機炭化物粉末と共通する同一元素の無機酸化物粉
末は、共通する同一元素の無機炭化物粉末に比して比較
的柔らかいため、この種の無機酸化物粉末によって磁気
ヘッドの摩耗が充分に抑制される。さらに両者はともに
共通の同一元素を有するため、磁性層中での親和性がよ
く、磁性層中に均一に分散される。従って、これら両者
を併用すると、その磁性層補強効果を磁気ヘッドを摩耗
させることなく充分に発揮させることができ、磁気ヘッ
ドの摩耗を充分に抑制しながら磁性層の耐摩耗性が充分
に向上される。
The carbide powder used in this invention is preferably an inorganic carbide powder with a Bierker's hardness of 1500 kg/mr or more, and a Vickers hardness of 1,500 kg/mr.
When it is +f or more, the inorganic carbide powder is relatively hard and the wear resistance of the magnetic layer is sufficiently improved. In addition, the inorganic oxide powder that has the same element in common with this inorganic carbide powder is relatively softer than the inorganic carbide powder that has the same element in common, so this type of inorganic oxide powder sufficiently suppresses the wear of the magnetic head. be done. Furthermore, since both have the same element in common, they have good affinity in the magnetic layer and are uniformly dispersed in the magnetic layer. Therefore, when these two are used together, the effect of reinforcing the magnetic layer can be fully exhibited without causing wear on the magnetic head, and the wear resistance of the magnetic layer can be sufficiently improved while sufficiently suppressing wear on the magnetic head. Ru.

このようなど、カース硬度が1500kg/mm以上の
無機炭化物粉末としては、Si、Ti、Zr、W、Ta
、V、Nb、、Hf、Bから選ばれるいずれかの元素の
無機炭化物粉末が好ましく使用され、また酸化物無機粉
末としては、これらの元素の無機酸化物粉末が好適なも
のとして使用される。このようなS i、 ′r i、
Z r、、W、Ta、■、NbXHf、Bから選ばれる
いずれかの元素の無機炭化物粉末は、平均粒子径が0.
1μmより小さいものでは所期の効果が得られず、一方
0.7μmより大きいものを使用すると、磁気へノドが
1■[しされるおそれがあるため、平均粒子径が0.1
〜0.7μmの範囲内のものを使用す5のが好ましく、
また無機酸化物粉末は、平均粒子径が0.02μmより
小さいものでは所期の効果を得られず、1.0μmより
大きいものを使用すると磁性層の表面粗さが悪くなり、
電磁変換特性が低下するため、平均粒子径が0.02〜
1.0μmの範囲内のものを使用するのが好ましい。
Examples of such inorganic carbide powders having a carth hardness of 1500 kg/mm or more include Si, Ti, Zr, W, and Ta.
, V, Nb, , Hf, and B are preferably used, and as the oxide inorganic powder, inorganic oxide powders of these elements are preferably used. Such S i, ′r i,
The inorganic carbide powder of any element selected from Zr, W, Ta, ■, NbXHf, and B has an average particle size of 0.
If the particle size is smaller than 1 μm, the desired effect cannot be obtained, while if the particle size is larger than 0.7 μm, the magnetic field may be damaged by 1 μm.
It is preferable to use one within the range of ~0.7 μm,
Furthermore, if the average particle size of the inorganic oxide powder is smaller than 0.02 μm, the desired effect will not be obtained, and if the average particle size is larger than 1.0 μm, the surface roughness of the magnetic layer will deteriorate.
Because the electromagnetic conversion characteristics deteriorate, the average particle diameter is 0.02~
It is preferable to use one within the range of 1.0 μm.

このようなビッカース硬度が1500kg/mm以上の
無機炭化物粉末と、共通する同一元素の無機酸化物粉末
との配合割合は、重量比(無機炭化物粉末対無機酸化物
粉末)にして1対9〜9対lの範囲内にするのが好まし
く、無機炭化物粉末が少なすぎては磁性層の耐摩耗性が
充分に向上されず、無機酸化物粉末が少なすぎては磁気
ヘッドの摩耗が充分に抑制されない。また、このような
配合割合で配合した前記の共通の同一元素を有する無機
炭化物粉末と、無R酸化物粉末の使用量は、両者合わせ
て磁性粉末に対して0.5〜15重■%の範囲内にする
のが好ましく、少なすぎると所期のすJ果が得られず、
多すぎると相対的に磁性粉末が減少し、電磁変換特性の
劣化を沼くおそれがあるため好ましくない。
The mixing ratio of such an inorganic carbide powder with a Vickers hardness of 1500 kg/mm or more and an inorganic oxide powder of the same common element is 1:9 to 9 in terms of weight ratio (inorganic carbide powder to inorganic oxide powder). It is preferable that the amount is within the range of 1. If the amount of inorganic carbide powder is too small, the wear resistance of the magnetic layer will not be sufficiently improved, and if the amount of inorganic oxide powder is too small, the wear of the magnetic head will not be sufficiently suppressed. . In addition, the amount of the inorganic carbide powder having the same common element and the R-free oxide powder combined in such a blending ratio is 0.5 to 15% by weight based on the magnetic powder. It is preferable to keep it within the range; if it is too small, the desired effect will not be obtained.
If the amount is too large, the amount of magnetic powder will be relatively reduced, which may lead to deterioration of electromagnetic conversion characteristics, which is not preferable.

このように前記の共通の同−元靴ををするビッカース硬
度が1500kg/mm以ヒの無機炭化物粉末と、無機
酸化物粉末を、前記の使用割合で使用すると、無機炭化
物粉末の優れた磁性層補強機能と、無機酸化物粉末の優
れた磁気ヘッド摩耗抑制作用が充分に発揮され、電磁変
換特性が劣化したり、磁性層に傷がついたり、ま忙磁気
ヘッドを摩耗したりすることなく、磁性層の耐摩耗性が
充分に改善される。このような効果は使用する磁性粉末
がいかなる磁性粉末であってら、充分に発1i!される
が、特に、粒子径が0.3μm以下の微細なもの、ある
いは金泥磁性粉末や合令磁性粉末などのように磁性層の
機械的強度を補強できない磁性粉末を使用するとき、一
段とその効果が発揮される。
In this way, when an inorganic carbide powder with a Vickers hardness of 1500 kg/mm or more and an inorganic oxide powder are used in the above-mentioned proportions, an excellent magnetic layer of the inorganic carbide powder can be obtained. The reinforcing function and the excellent magnetic head wear suppression effect of the inorganic oxide powder are fully demonstrated, and the electromagnetic conversion characteristics do not deteriorate, the magnetic layer is not scratched, or the busy magnetic head is not worn out. The wear resistance of the magnetic layer is sufficiently improved. Such an effect can be sufficiently produced no matter what kind of magnetic powder is used! However, especially when using fine particles with a particle size of 0.3 μm or less, or magnetic powders that cannot reinforce the mechanical strength of the magnetic layer, such as gold mud magnetic powder or composite magnetic powder, the effect becomes even more effective. is demonstrated.

磁性粉末としては、たとえば、r−Fe203粉末、F
e3O4粉末、Co含有r−Fe20゜粉末、Co含有
Fe3O4粉末、CrO2粉末の他、Fe粉末、Co粉
末、Fe−’Ji粉末、バリウムフェライト粉床なと従
来公知の各種磁性粉末が広く使用される。
Examples of magnetic powder include r-Fe203 powder, F
In addition to e3O4 powder, Co-containing r-Fe20° powder, Co-containing Fe3O4 powder, and CrO2 powder, various conventionally known magnetic powders such as Fe powder, Co powder, Fe-'Ji powder, and barium ferrite powder bed are widely used. .

また、結合剤成分としては塩化ビニル−酢酸ビニル系共
重合体、繊維素系樹脂、ポリウレタン系樹脂、ポリエス
テル系樹脂、アクリル系樹脂、ゴム系樹脂、イソシアネ
ート化合物など、1IfI當磁性粉末の結合剤成分とし
て使用されるものが広く使用される。
In addition, binder components of the 1IfI magnetic powder include vinyl chloride-vinyl acetate copolymers, cellulose resins, polyurethane resins, polyester resins, acrylic resins, rubber resins, isocyanate compounds, etc. It is widely used as

この発明の磁気記録媒体を製造するには常法に準じて行
えばよく、たとえば、前記の共通の同一元素を有する無
機炭化物粉末と、無機酸化物粉末とを、磁性粉末、結合
剤樹脂、有機溶剤等とともに混合分散して磁性塗料を調
製し、これをポリエステルフィルムなどの基体上に口〜
ルコーターなど任意の塗布手段によって塗布し、乾燥す
ればよい。
The magnetic recording medium of the present invention may be manufactured according to a conventional method. For example, the above-mentioned inorganic carbide powder having the same common element and inorganic oxide powder may be mixed into magnetic powder, binder resin, organic A magnetic paint is prepared by mixing and dispersing it with a solvent, etc., and it is applied onto a substrate such as a polyester film.
It may be applied by any coating means such as a coater and dried.

なお、磁性塗料中には通常使用されている各種添加剤、
たとえば、脂肪酸、脂肪酸エステル、シリコーン系1I
11滑剤、フ、素系/I2I沿剤等の潤滑剤および分散
剤や、カーボンブランクなどの帯電防止剤などを任意に
添加使用してもよい。
In addition, various additives commonly used in magnetic paints,
For example, fatty acids, fatty acid esters, silicone 1I
Lubricants and dispersants such as 11 lubricants, fluoride, base type/I2I additives, antistatic agents such as carbon blank, etc. may be optionally added and used.

〔実施例〕〔Example〕

次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.

実施例1 cr−F13粉末(粒子径0.2pm  loO¥ti
m部、BET法による比表面積:;5 m / g ) SiC粉末(粒子径0.3μm    6  //ビッ
カース硬度約3000 kg / m m )Si02
粉末(粒子径01lI!m1〃以下) ステアリン酸−n−ブチル    2 〃V A G 
11 (U、C,C社製、塩化ビ  14″ニル−酢酸
ビニル−ビニルア ルコール共重合体) バンデノクスT−5201(k、  10  =日本イ
ンキ化学工業社製、ボ リウレクン樹脂) シクロへキサノン        901−メチルイソ
ブチルケトン     90″トルエン       
    90〃この組成物をボールミルにて100時間
時間分散した後、デスモジュールしくバイエル社製、三
官能性低分子量イソシアネート化合物)を4m最部加え
、1時間さらに均一に混合分散して磁性塗料を調製した
。この磁性塗料を厚さ10μmのポリエステルフィルム
上に、乾燥J′g、が3μmとなるように塗布、乾燥し
、カレンダ処理を行った後、1/2インチ幅に裁断して
ビデオテープをつくった。
Example 1 cr-F13 powder (particle size 0.2pm loO\ti
m part, specific surface area by BET method: ;5 m/g) SiC powder (particle size 0.3 μm 6 //Vickers hardness approximately 3000 kg/mm) Si02
Powder (particle size 01lI!m1 or less) n-butyl stearate 2 V A G
11 (manufactured by U, C, C Company, vinyl chloride 14''-vinyl acetate-vinyl alcohol copolymer) Vandenox T-5201 (k, 10 = manufactured by Nippon Ink Chemical Co., Ltd., polyurekne resin) Cyclohexanone 901-methyl Isobutyl ketone 90″ toluene
90 After dispersing this composition in a ball mill for 100 hours, 4 m of Desmodulite (manufactured by Bayer AG, trifunctional low molecular weight isocyanate compound) was added to the bottom, and the mixture was further uniformly mixed and dispersed for 1 hour to prepare a magnetic paint. did. This magnetic paint was applied onto a polyester film with a thickness of 10 μm so that the dry J'g was 3 μm, dried, calendered, and then cut into 1/2 inch width to make a videotape. .

実施例2 実施例1における磁性塗料の1■成において、SiC粉
末に代えて、TiC粉末(粒子径0.3μm、ビッカー
ス硬度約2000kg/mm)を同量使用し、S i 
O2扮未に代えて、TiO2,粉末(粒子径0.2μm
)を3E1[部使用した以外は実施例1と同様にしてビ
デオテープをつ(った。
Example 2 In the first formation of the magnetic paint in Example 1, the same amount of TiC powder (particle size 0.3 μm, Vickers hardness approximately 2000 kg/mm) was used instead of SiC powder, and Si
Instead of O2, TiO2 powder (particle size 0.2 μm
A videotape was produced in the same manner as in Example 1, except that 3E1 parts of (3E1) were used.

実施例3 実施例2における磁性塗料の組成において、α−Fe粉
末に代えて、Co %)J着r−Fe20,1°5)未
(粒子径0.3μm、BET法による比表面積45rr
f/g)を同量使用し、シクロヘキサノン、メチルイソ
ブチルケトンおよびトルエンの使用量をそれぞれ90重
量部から70重9部に変更した以外は実施例1と同様に
してビデオテープをつくった。
Example 3 In the composition of the magnetic paint in Example 2, α-Fe powder was replaced with Co %) J-attached r-Fe20,1°5) (particle size 0.3 μm, specific surface area 45rr by BET method).
A videotape was made in the same manner as in Example 1, except that the same amount of cyclohexanone, methyl isobutyl ketone, and toluene were used, and the amounts of cyclohexanone, methyl isobutyl ketone, and toluene were changed from 90 parts by weight to 9 parts by weight, respectively.

比較例1 実施例1における磁性塗料の組成において、SiC粉末
に代えて、α−A1203粉末(粒子径0.3μm、ビ
ッカース硬度約2000 kg/mn?)を同量使用し
た以外は実施例1と同様にしてビデオテープをつくった
Comparative Example 1 Same as Example 1 except that the same amount of α-A1203 powder (particle size 0.3 μm, Vickers hardness about 2000 kg/mn?) was used instead of SiC powder in the composition of the magnetic paint in Example 1. I made a videotape in the same way.

比較例2 実施例2における磁性塗料の組成において、TiC粉末
に代えて、SiC粉末(粒子径0.3μm、ビッカース
硬度約3000kg/mm)を同量使用した以外は実施
例1と同様にしてビデオテープをつくった。
Comparative Example 2 Video was produced in the same manner as in Example 1, except that in the composition of the magnetic paint in Example 2, the same amount of SiC powder (particle size 0.3 μm, Vickers hardness approximately 3000 kg/mm) was used instead of TiC powder. I made a tape.

比較例3 実施例3における磁性塗料の組成において、SiC粉末
に代えて、α−A1203粉末(粒子径0.3μm、ビ
ッカース硬度約2000 kg/mm)を同量使用した
以外は実施例1と同様にしてビデオテープをつくった。
Comparative Example 3 Same as Example 1 except that the same amount of α-A1203 powder (particle size 0.3 μm, Vickers hardness about 2000 kg/mm) was used instead of SiC powder in the composition of the magnetic paint in Example 3. I made a videotape.

各実施例および比較例で得られたビデオテープを市販の
VTRに装着し、下記の方法で磁気ヘッドの摩耗量とス
チルライフを測定した。
The video tapes obtained in each of the Examples and Comparative Examples were mounted on a commercially available VTR, and the wear amount and still life of the magnetic head were measured using the following methods.

〈磁気ヘッドの摩耗量〉 ビデオテープを100時間走行させた後の磁気ヘッドの
摩耗量を、シリンダからのへノドの突出量の変化で測定
した。
<Amount of Wear of Magnetic Head> Amount of wear of the magnetic head after running a video tape for 100 hours was measured by a change in the amount of protrusion of the head from the cylinder.

〈スチルライフ〉 ビデオテープをスチルモードで再生し、その再生出力レ
ヘルが初期値から20dB低下するまでの時間を測定し
た。
<Still Life> A videotape was played back in still mode, and the time required for the playback output level to drop by 20 dB from the initial value was measured.

下記第1表はその結果である。Table 1 below shows the results.

第1表 上記第1表から明らかなように、実施例1〜3で得られ
たビデオテープは、いずれも比較例1〜3で得られたビ
デオテープに比し、スチルライフが長くて、磁気ヘッド
の摩耗量が少なく、このことからこの発明によって得ら
れる磁気記録媒体は、磁気ヘッドの摩耗を充分に抑制す
ることができて、しかも耐久性が充分に向上されている
ごとがわかる。
Table 1 As is clear from Table 1 above, the videotapes obtained in Examples 1 to 3 had longer still lifes and magnetic fields compared to those obtained in Comparative Examples 1 to 3. The amount of wear on the head is small, which indicates that the magnetic recording medium obtained by the present invention can sufficiently suppress wear on the magnetic head and has sufficiently improved durability.

Claims (1)

【特許請求の範囲】 1、磁性層中に、ビッカース硬度が1500kg/mm
^2以上の無機炭化物粉末と、該無機炭化物と共通する
同一元素の無機酸化物粉末とを含有させたことを特徴と
する磁気記録媒体 2、無機炭化物粉末と無機酸化物粉末の共通する同一元
素が、Si、Ti、Zr、W、Ta、V、Nb、、Hf
、Bから選ばれるいずれかである特許請求の範囲第1項
記載の磁気記録媒体
[Claims] 1. The magnetic layer has a Vickers hardness of 1500 kg/mm.
Magnetic recording medium 2 characterized in that it contains at least ^2 inorganic carbide powder and an inorganic oxide powder having the same element in common with the inorganic carbide, the inorganic carbide powder and the inorganic oxide powder having the same element in common. is Si, Ti, Zr, W, Ta, V, Nb,, Hf
, B. The magnetic recording medium according to claim 1, which is selected from
JP60293695A 1985-12-26 1985-12-26 Magnetic recording medium Pending JPS62154230A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60293695A JPS62154230A (en) 1985-12-26 1985-12-26 Magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60293695A JPS62154230A (en) 1985-12-26 1985-12-26 Magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS62154230A true JPS62154230A (en) 1987-07-09

Family

ID=17798039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60293695A Pending JPS62154230A (en) 1985-12-26 1985-12-26 Magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS62154230A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2684105A1 (en) * 1991-11-21 1993-05-28 Neyrpic WEAR RESISTANT COMPOSITE MATERIALS AND PROCESS FOR THEIR MANUFACTURE.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2684105A1 (en) * 1991-11-21 1993-05-28 Neyrpic WEAR RESISTANT COMPOSITE MATERIALS AND PROCESS FOR THEIR MANUFACTURE.
KR100241799B1 (en) * 1991-11-21 2000-02-01 네이르삑 Wear-resistant composite material and method for its manufacture

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